The CPR Aquatic In-Tank Refugium, Pro Large Deluxe (CITRPROLGDX) is a "safe house" that provides a protected area to help newly added fish or invertebrates easily acclimate to a new tank while also providing a place for injured fish or corals to regenerate damaged tissue without the need for a separate quarantine tank. This Pro version features a black back and a sliding bracket that holds the Refugium in place on the edge of the tank (rather than suction cups).

The CITRPROLGDX also functions as a culturing area for small organisms that are intended to be provided as a food source for the inhabitants of the main portion of the tank. The versatility and easy use of the CITRPROLGDX make it a valuable addition to every aquarist's tank.